diff --git a/sdk/formrecognizer/ai-form-recognizer/src/azureKeyCredentialPolicy.ts b/sdk/formrecognizer/ai-form-recognizer/src/azureKeyCredentialPolicy.ts
index cfbf4955750d..5be0796948d3 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/azureKeyCredentialPolicy.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/azureKeyCredentialPolicy.ts
@@ -17,6 +17,8 @@ const API_KEY_HEADER_NAME = "Ocp-Apim-Subscription-Key";
 /**
  * Create an HTTP pipeline policy to authenticate a request
  * using an `AzureKeyCredential` for Azure Form Recognizer
+ *
+ * @internal
  */
 export function createFormRecognizerAzureKeyCredentialPolicy(
   credential: KeyCredential
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/constants.ts b/sdk/formrecognizer/ai-form-recognizer/src/constants.ts
index 3d6067e4ef0a..7c4981d61cf3 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/constants.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/constants.ts
@@ -9,10 +9,14 @@ export const LIB_INFO = `azsdk-js-ai-formrecognizer/${SDK_VERSION}`;
 
 /**
  * Maximum size of input documents allowed by the Azure Form Recognizer service.
+ *
  * @internal
  */
 export const MAX_INPUT_DOCUMENT_SIZE = 50 * 1024 * 1024; // 50 MB
 
+/**
+ * @internal
+ */
 export const FormRecognizerLoggingAllowedHeaderNames = [
   "apim-request-id",
   "Location",
@@ -22,6 +26,9 @@ export const FormRecognizerLoggingAllowedHeaderNames = [
   "x-envoy-upstream-service-time"
 ];
 
+/**
+ * @internal
+ */
 export const FormRecognizerLoggingAllowedQueryParameters = [
   "includeTextDetails",
   "includeKeys",
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/formTrainingClient.ts b/sdk/formrecognizer/ai-form-recognizer/src/formTrainingClient.ts
index 9e4e5eab951b..028cc841d6b4 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/formTrainingClient.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/formTrainingClient.ts
@@ -352,6 +352,11 @@ export class FormTrainingClient {
     }
   }
 
+  /**
+   * (INTERNAL) Provides an async iterable of model pages.
+   *
+   * @hidden
+   */
   private async *listModelsPage(
     settings: PageSettings,
     options: ListModelsOptions = {}
@@ -370,6 +375,11 @@ export class FormTrainingClient {
     }
   }
 
+  /**
+   * (INTERNAL) Create an async iterable of all models in an account.
+   *
+   * @hidden
+   */
   private async *listModelsAll(
     settings: PageSettings,
     options: ListModelsOptions = {}
@@ -441,6 +451,11 @@ export class FormTrainingClient {
     };
   }
 
+  /**
+   * (INTERNAL) Get the first page of models
+   *
+   * @hidden
+   */
   private async list(options?: ListModelsOptions): Promise<ListCustomModelsResponse> {
     const realOptions: ListModelsOptions = options || {};
     const { span, updatedOptions: finalOptions } = createSpan(
@@ -465,6 +480,11 @@ export class FormTrainingClient {
     }
   }
 
+  /**
+   * (INTERNAL) Get a page of models using a nextLink
+   *
+   * @hidden
+   */
   private async listNextPage(
     nextLink: string,
     options?: ListModelsOptions
@@ -710,6 +730,11 @@ export class FormTrainingClient {
     return poller;
   }
 
+  /**
+   * (INTERNAL) Start a model copying operation.
+   *
+   * @hidden
+   */
   private async beginCopyModelInternal(
     modelId: string,
     copyAuthorization: CopyAuthorization,
@@ -745,6 +770,11 @@ export class FormTrainingClient {
     }
   }
 
+  /**
+   * (INTERNAL) Get the result of an in-progress model copying operation.
+   *
+   * @hidden
+   */
   private async getCopyModelResult(
     modelId: string,
     resultId: string,
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/internalModels.ts b/sdk/formrecognizer/ai-form-recognizer/src/internalModels.ts
index 6e841b0c911f..7659c9a2e5c6 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/internalModels.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/internalModels.ts
@@ -11,6 +11,8 @@ import { RecognizedForm, FormPage } from "./models";
 
 /**
  * Represents the result from an Recognize Content operation
+ *
+ * @internal
  */
 export interface RecognizedContent {
   /**
@@ -41,6 +43,8 @@ export interface RecognizedContent {
 
 /**
  * Contains response data for the Recognize Content operation.
+ *
+ * @internal
  */
 export type RecognizeContentResultResponse = RecognizedContent & {
   /**
@@ -60,6 +64,8 @@ export type RecognizeContentResultResponse = RecognizedContent & {
 
 /**
  * Represents the result from an recognize form operation using a custom model from training.
+ *
+ * @internal
  */
 export interface RecognizedForms {
   /**
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/logger.ts b/sdk/formrecognizer/ai-form-recognizer/src/logger.ts
index 660d6424e827..e6c1dcd287a9 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/logger.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/logger.ts
@@ -5,5 +5,7 @@ import { createClientLogger } from "@azure/logger";
 
 /**
  * The \@azure/logger configuration for this package.
+ *
+ * @internal
  */
 export const logger = createClientLogger("ai-form-recognizer");
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/contentPoller.ts b/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/contentPoller.ts
index 97fa67635027..dbbe60affdd9 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/contentPoller.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/contentPoller.ts
@@ -14,6 +14,9 @@ import { FormRecognizerRequestBody, FormPageArray } from "../../models";
 import { RecognizeContentResultResponse } from "../../internalModels";
 export { OperationStatus };
 
+/**
+ * @internal
+ */
 export interface ContentPollerOperationOptions {
   /**
    * Time between each polling in milliseconds.
@@ -32,6 +35,8 @@ export interface ContentPollerOperationOptions {
 /**
  * Defines the operations from a analyze client that are needed for the poller
  * to work
+ *
+ * @internal
  */
 export type RecognizeContentPollerClient = {
   // returns a result id to retrieve results
@@ -56,6 +61,9 @@ export interface BeginRecognizeContentPollState extends PollOperationState<FormP
   readonly analyzeOptions?: BeginRecognizeContentOptions;
 }
 
+/**
+ * @internal
+ */
 export interface BeginRecognizeContentPollerOperation
   extends PollOperation<BeginRecognizeContentPollState, FormPageArray> {}
 
@@ -74,6 +82,8 @@ export type BeginRecognizeContentPollerOptions = {
 
 /**
  * Class that represents a poller that waits until a model has been trained.
+ *
+ * @internal
  */
 export class BeginRecognizeContentPoller extends Poller<
   BeginRecognizeContentPollState,
@@ -121,8 +131,10 @@ export class BeginRecognizeContentPoller extends Poller<
     return delay(this.updateIntervalInMs);
   }
 }
+
 /**
  * Creates a poll operation given the provided state.
+ *
  * @internal
  */
 function makeBeginRecognizePollOperation(
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/recognitionPoller.ts b/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/recognitionPoller.ts
index cebce56d1123..f285d8a03ea3 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/recognitionPoller.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/lro/analyze/recognitionPoller.ts
@@ -13,6 +13,7 @@ import { toRecognizedFormArray } from "../../transforms";
 
 /**
  * Options for Form Recognition shared between prebuilt and custom models.
+ * @internal
  */
 export interface FormPollerOperationOptions {
   /**
@@ -35,6 +36,8 @@ export interface FormPollerOperationOptions {
 /**
  * Encapsulates the steps to start and query the status of
  * a form recognition operation
+ *
+ * @internal
  */
 export interface FormRecognitionOperationClient {
   /**
@@ -133,6 +136,7 @@ function makeFormRecognitionOperation(
 
 /**
  * Set of intrinsic properties that describe a form recognition polling operation.
+ * @internal
  */
 export type FormPollerOperationDescription = FormPollerOperationOptions &
   FormRecognitionOperationClient & {
@@ -152,6 +156,8 @@ const DEFAULT_POLLING_INTERVAL = 5000;
 /**
  * A poller for Form Recognition that works for all analysis endpoints
  * that return the basic, weakly-typed `RecognizedFormArray` type.
+ *
+ * @internal
  */
 export class FormRecognitionPoller extends Poller<
   RecognizeFormsOperationState,
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/lro/copy/poller.ts b/sdk/formrecognizer/ai-form-recognizer/src/lro/copy/poller.ts
index ca12745c97d5..8a283f61e162 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/lro/copy/poller.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/lro/copy/poller.ts
@@ -13,6 +13,9 @@ import {
 import { CopyAuthorization, CustomFormModelInfo } from "../../models";
 export { OperationStatus };
 
+/**
+ * @internal
+ */
 export interface CopyPollerOperationOptions {
   /**
    * Time between each polling in milliseconds.
@@ -31,6 +34,8 @@ export interface CopyPollerOperationOptions {
 /**
  * Defines the operations from a training client that are needed for the poller
  * to work
+ *
+ * @internal
  */
 export type CopyModelPollerClient = {
   // returns a result id to retrieve results
@@ -88,6 +93,9 @@ export interface BeginCopyModelPollState extends PollOperationState<CustomFormMo
   readonly copyModelOptions?: CopyModelOptions;
 }
 
+/**
+ * @internal
+ */
 export interface BeginCopyModelPollerOperation
   extends PollOperation<BeginCopyModelPollState, CustomFormModelInfo> {}
 
@@ -108,6 +116,7 @@ export type BeginCopyModelPollerOptions = {
 
 /**
  * Class that represents a poller that waits until a model has been trained.
+ * @internal
  */
 export class BeginCopyModelPoller extends Poller<BeginCopyModelPollState, CustomFormModelInfo> {
   public updateIntervalInMs: number;
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/lro/train/poller.ts b/sdk/formrecognizer/ai-form-recognizer/src/lro/train/poller.ts
index 445380d6cedd..69bbfc3d4a9e 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/lro/train/poller.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/lro/train/poller.ts
@@ -15,6 +15,8 @@ export { ModelStatus, TrainCustomModelAsyncResponse };
 /**
  * Defines the operations from a {@link FormRecognizerClient} that are needed for the poller
  * returned by {@link FormRecognizerClient.beginTraining} to work.
+ *
+ * @internal
  */
 export type TrainPollerClient = {
   getCustomModel: (modelId: string, options: GetModelOptions) => Promise<FormModelResponse>;
@@ -67,6 +69,8 @@ export interface BeginTrainingPollerOptions {
 
 /**
  * Class that represents a poller that waits until a model has been trained.
+ *
+ * @internal
  */
 export class BeginTrainingPoller extends Poller<BeginTrainingPollState, CustomFormModel> {
   public updateIntervalInMs: number;
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/tracing.ts b/sdk/formrecognizer/ai-form-recognizer/src/tracing.ts
index ca9e15799641..7a77793a613a 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/tracing.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/tracing.ts
@@ -5,6 +5,7 @@ import { createSpanFunction } from "@azure/core-tracing";
 
 /**
  * Creates a span using the global tracer.
+ *
  * @internal
  */
 export const createSpan = createSpanFunction({
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/transforms.ts b/sdk/formrecognizer/ai-form-recognizer/src/transforms.ts
index 5008cc1b48ff..8e1cc34cea4b 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/transforms.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/transforms.ts
@@ -39,6 +39,9 @@ import {
 } from "./models";
 import { RecognizeContentResultResponse } from "./internalModels";
 
+/**
+ * @internal
+ */
 function toBoundingBox(original: number[]): Point2D[] {
   return [
     { x: original[0], y: original[1] },
@@ -48,6 +51,9 @@ function toBoundingBox(original: number[]): Point2D[] {
   ];
 }
 
+/**
+ * @internal
+ */
 export function toTextLine(original: TextLineModel, pageNumber: number): FormLine {
   const appearance =
     original.appearance !== undefined
@@ -77,6 +83,9 @@ export function toTextLine(original: TextLineModel, pageNumber: number): FormLin
   return line;
 }
 
+/**
+ * @internal
+ */
 export function toSelectionMark(original: SelectionMark, pageNumber: number): FormSelectionMark {
   return {
     kind: "selectionMark",
@@ -87,6 +96,9 @@ export function toSelectionMark(original: SelectionMark, pageNumber: number): Fo
   };
 }
 
+/**
+ * @internal
+ */
 export function toFormPage(original: ReadResultModel): FormPage {
   return {
     pageNumber: original.pageNumber,
@@ -102,6 +114,9 @@ export function toFormPage(original: ReadResultModel): FormPage {
 // Note: might need to support other element types in future, e.g., checkbox
 const textPattern = /\/readResults\/(\d+)\/lines\/(\d+)(?:\/words\/(\d+))?/;
 
+/**
+ * @internal
+ */
 export function toFormContent(element: string, readResults: FormPage[]): FormElement {
   const result = textPattern.exec(element);
   if (!result || !result[0] || !result[1] || !result[2]) {
@@ -118,6 +133,9 @@ export function toFormContent(element: string, readResults: FormPage[]): FormEle
   }
 }
 
+/**
+ * @internal
+ */
 export function toFieldData(
   pageNumber: number,
   original: KeyValueElementModel,
@@ -131,6 +149,9 @@ export function toFieldData(
   };
 }
 
+/**
+ * @internal
+ */
 export function toFormFieldFromKeyValuePairModel(
   pageNumber: number,
   original: KeyValuePairModel,
@@ -146,6 +167,9 @@ export function toFormFieldFromKeyValuePairModel(
   };
 }
 
+/**
+ * @internal
+ */
 export function toFormTable(
   original: DataTableModel,
   readResults: FormPage[],
@@ -172,6 +196,9 @@ export function toFormTable(
   };
 }
 
+/**
+ * @internal
+ */
 export function toFormPages(
   readResults?: ReadResultModel[],
   pageResults?: PageResultModel[]
@@ -192,6 +219,9 @@ export function toFormPages(
   );
 }
 
+/**
+ * @internal
+ */
 export function toRecognizedFormArray(
   original: GetAnalyzeFormResultResponse,
   expectedDocTypePrefix?: string
@@ -221,6 +251,9 @@ export function toRecognizedFormArray(
   }
 }
 
+/**
+ * @internal
+ */
 export function toFormFieldFromFieldValueModel(
   original: FieldValueModel,
   key: string,
@@ -290,6 +323,9 @@ export function toFormFieldFromFieldValueModel(
   } as FormField;
 }
 
+/**
+ * @internal
+ */
 export function toFieldsFromFieldValue(
   original: { [propertyName: string]: FieldValueModel | null },
   readResults: FormPage[]
@@ -309,6 +345,9 @@ export function toFieldsFromFieldValue(
   return result;
 }
 
+/**
+ * @internal
+ */
 export function toFieldsFromKeyValuePairs(
   pageNumber: number,
   original: KeyValuePairModel[],
@@ -326,6 +365,9 @@ export function toFieldsFromKeyValuePairs(
   return result;
 }
 
+/**
+ * @internal
+ */
 export function toFormFromPageResult(original: PageResultModel, pages: FormPage[]): RecognizedForm {
   return {
     formType: `form-${original.clusterId}`,
@@ -337,6 +379,9 @@ export function toFormFromPageResult(original: PageResultModel, pages: FormPage[
   };
 }
 
+/**
+ * @internal
+ */
 export function toRecognizedForm(original: DocumentResultModel, pages: FormPage[]): RecognizedForm {
   return {
     formType: original.docType,
@@ -350,6 +395,9 @@ export function toRecognizedForm(original: DocumentResultModel, pages: FormPage[
   };
 }
 
+/**
+ * @internal
+ */
 export function toRecognizeContentResultResponse(
   original: GetAnalyzeLayoutResultResponse
 ): RecognizeContentResultResponse {
@@ -383,6 +431,9 @@ export function toRecognizeContentResultResponse(
   }
 }
 
+/**
+ * @internal
+ */
 function flattenTrainingDocuments(
   original: GetCustomModelResponse
 ): TrainingDocumentInfo[] | undefined {
@@ -409,6 +460,9 @@ function flattenTrainingDocuments(
   return undefined;
 }
 
+/**
+ * @internal
+ */
 function toSubmodelsFromComposedTrainResults(results: TrainResult[]): CustomFormSubmodel[] {
   const mappedSubmodels = results.map((r) => toSubmodelsFromTrainResultLabeled(r));
 
@@ -416,6 +470,9 @@ function toSubmodelsFromComposedTrainResults(results: TrainResult[]): CustomForm
   return ([] as CustomFormSubmodel[]).concat(...mappedSubmodels);
 }
 
+/**
+ * @internal
+ */
 function toSubmodelsFromTrainResultLabeled(
   result: TrainResult,
   modelName?: string
@@ -438,6 +495,9 @@ function toSubmodelsFromTrainResultLabeled(
   ];
 }
 
+/**
+ * @internal
+ */
 function toSubmodelsFromTrainResultUnlabeled(
   keys: KeysResult,
   modelId: string
@@ -460,6 +520,9 @@ function toSubmodelsFromTrainResultUnlabeled(
   );
 }
 
+/**
+ * @internal
+ */
 function flattenCustomFormSubmodels(
   original: GetCustomModelResponse
 ): CustomFormSubmodel[] | undefined {
@@ -477,6 +540,9 @@ function flattenCustomFormSubmodels(
   return undefined;
 }
 
+/**
+ * @internal
+ */
 export function toCustomFormModelProperties(
   original: Attributes | undefined
 ): CustomFormModelProperties | undefined {
@@ -489,6 +555,9 @@ export function toCustomFormModelProperties(
   }
 }
 
+/**
+ * @internal
+ */
 export function toFormModelResponse(response: GetCustomModelResponse): FormModelResponse {
   return {
     status: response.modelInfo.status,
diff --git a/sdk/formrecognizer/ai-form-recognizer/src/utils/utils.node.ts b/sdk/formrecognizer/ai-form-recognizer/src/utils/utils.node.ts
index fadeb16eeea5..1f7b40720e39 100644
--- a/sdk/formrecognizer/ai-form-recognizer/src/utils/utils.node.ts
+++ b/sdk/formrecognizer/ai-form-recognizer/src/utils/utils.node.ts
@@ -10,6 +10,8 @@ const SIZE_ONE_MEGA = 1024 * 1024;
  * @param stream - A Node.js Readable stream
  * @returns The resultant buffer.
  * @throws If buffer size is not big enough.
+ *
+ * @internal
  */
 export async function streamToBuffer(
   stream: NodeJS.ReadableStream,
@@ -58,6 +60,9 @@ export async function streamToBuffer(
   });
 }
 
+/**
+ * @internal
+ */
 export function getFirstFourBytesFromBlob(_data: Blob): Promise<Uint8Array> {
   throw new Error("Blob is not supported in NodeJS environment");
 }